Temper-Resistance of Cr-W-Mo-V High Carbon Medium Alloy Steel and Its Hardness Forecast
The temper-resistance temperature of Cr-W-Mo-V high carbon medium alloy steels is in a range at 200℃-300℃.Along with increasing C and alloy contents in particular Cr content of the steels,the temper-resistance is boost up gradually and maximal hardness arrives to 63-64HRC at temperature 200 ℃-250 ℃.When budget for quenching matrix composition and undissolved carbides,the actual quenching temperature TH is corresponding to the calculational temperature Tc by phase-equilibrium thermodynamics as TH=Tc + (1000℃-Tc)/6.5,and roughly,the calculational temperature is less 20℃ than actual temperature when quenching at 800℃-890℃.The carbides precipitation during tempering is agreement with phase equilibrium thermodynamic calculation incompletely,thereinto (Fe,Cr)3C carbide precipitation is leading at 200℃-250 ℃.The higher hardness at temper-resistance temperature is corresponding to tempering temperature of remnant austenitic decomposing acutely.The tempering hardness can be estimated on the basis of quenching hardness calculation.The quenching hardness value can be obtained from Hc=α (l+β)/(0.00915α+0.00527),in which α is the square root of carbon content in the matrix and β is correction coefficient of solid solution strengthening.
High carbon medium alloy steel Temper-resistance Quenching matrix composition Carbide precipitation Calculation of quenching hardness Tempering hardness forecast
Yongqing Ma Yumei Dai Yufen Liang Xiaojing Zhang
Department of Materials Science,Dalian Maritime University,Dalian,Liaoning116026,China College of Science,Shenyang University,Shenyang 110014,China Changzhou Machinery Blade CO.LTD,Changzhou,Jiangsu 213119,China
国际会议
西安
英文
591-596
2012-06-12（万方平台首次上网日期，不代表论文的发表时间）